Types of Relationships
http://trochim.human.cornell.edu/kb/relation.htm
This is a section of Trochim's site that discusses the nature of relationships.
Correlational Research Designs
http://www.tsum.edu/~trenckly/week4.htm
This is an excellent resource for information related to correlational research designs. It was developed by Tom Renckly at Troy State University—Montgomery and contains a number of excellent presentations of other research designs and issues related to them.
Correlational Research Methods
http://clem.mscd.edu/~davisj/prm2/correl1.html
This information discusses the underlying model of correlational research methods as well as seven different correlational approaches.
